Kahlenberg is a wooded height of 484 metres at the northern end of the Vienna Woods, where the hills stop and the Danube plain begins. From the terrace by the little church of St Joseph the whole city lies below. The spire of the Stephansdom rises out of the roofs, the river curves past the towers on its far bank, and beyond that flat country runs to the horizon. Marked trails climb to it from Nussdorf and Heiligenstadt through beech woods and terraced vines.
The walk is most of the point, and a ridge path links Kahlenberg to its neighbour Leopoldsberg. The best version is late afternoon up, and down through the vineyards into Grinzing or Nussdorf. The city's own waymarked round starts and ends down at the river, eleven kilometres for three and a half to four hours of walking. In September 1683 a relief force crossed these hills at the end of the second Ottoman siege of the city, and the church here carries plaques recording it.